**contsum** sets the parameters to be used to fit the continuum of
spectra on which
**sumspec**
is being run.
It is an IRAF "pset"; invocation causes eparam to
be run on the file *contsum.par*.
The following parameters may be modified:
**c_interactive** no
- Fit continuum interactively (yes or no). If yes, a
graph of the spectrum
and the continuum fit is plotted to stdgraph, with rejected points flagged.
The program waits until one of the following keys is typed:
**q** accept the fit and continue the main task,
**?** print options,
**d** delete pointnearest to cursor,
**u** undelete point nearest to cursor,
**f** refit and redraw the data.

**c_sample** "*"
- Sample of points to use in fit. "*" = all.
**c_function** spline3
- Continuum fitting function (spline3 or legendre or chebyshev or spline1)
**naverage** 1
- Number of points in sample averaging
**order** 1
- Order of fitting function
**s_low_reject** 2.
- Spectrum continuum fit minimum acceptance limit in sigma of fit
**s_high_reject** 2.
- Spectrum continuum fit maximum acceptance limit in sigma of fit
**t_low_reject** 2.
- Template continuum fit minimum acceptance limit in sigma of fit
**t_high_reject** 2.
- Template continuum fit maximum acceptance limit in sigma of fit
**niterate** 10
- Number of rejection iterations
**grow** 1.
- Rejection growing radius

### Example

To set continuum fit parameters,
rv> contsum

#### Last updated 20 October 2003